diff --git a/pyrogram/session/session.py b/pyrogram/session/session.py
index e023d88b..a6bc06d2 100644
--- a/pyrogram/session/session.py
+++ b/pyrogram/session/session.py
@@ -309,6 +309,12 @@ class Session:
                 if packet:
                     error_code = -Int.read(BytesIO(packet))
 
+                    if error_code == 404:
+                        raise Exception(
+                            "Auth key not found in the system. You must delete your session file"
+                            "and log in again with your phone number or bot token"
+                        )
+
                     log.warning(
                         "Server sent transport error: %s (%s)",
                         error_code, Session.TRANSPORT_ERRORS.get(error_code, "unknown error")